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Oil leaks and how to solve them on a manual hydraulic pump

As the main component of many hydraulic systems, the hydraulic pump continues to be used extensively by foresters, engineers and farmers. However, like all other hydraulic pumps, the hydraulic hand pump is not immune to oil leaks, which can lead to problems such as loss of pressure and engine damage. That's why it's important to carry out regular maintenance and servicing of manual hydraulic pumps is an absolute necessity. Would you like to find out more about the possible sources of oil leaks from a hydraulic pump and the guidelines for resolving them? Then this article is for you.

How do you recognise an oil leak in a manual hydraulic pump ?

Manuel de réparation de la pompe hydraulique Danfoss

To recognise an oil leak in a manual hydraulic pump, there are a number of signs to look out for.

First of all, the appearance of oil stains under the pump, whether on the floor or on other surfaces, may indicate a leak.

It is also important to check the oil level in the pump reservoir regularly. If you notice a drop in the oil level without having added oil recently, this could be a sign of a leak.

The presence of oil on pump components such as seals, valves, pistons, valves, fittings or hoses can also indicate a leak in progress.

Finally, reduced pump performance, such as reduced output pressure, reduced speed or loss of overall efficiency, can be attributed to an oil leak.


How important is it to solve an oil leak on a hydraulic pump ?

Solving the problem of oil leaks is crucial to keeping your equipment in good condition.

Indeed, these flows can have an impact on the performance of the hydraulic system as a whole. A prime example is when fluid pressure drops. This can affect the operation of rod ends, leading to unexpected downtime, lost production and high repair costs.

In addition, an oil leak can contaminate the hydraulic fluid and impair piston operation.

If you want to be able to enjoy your manual hydraulic pump for a long time, resolving any oil leaks that may occur on it remains the best decision you can make.

What causes oil leaks on a hydraulic pump ?

RESOLUT] problème verin hydraulique de grue de levage

If you notice anyearoil on your instrument, the first thing to do is to identify the source of the problem.

In the most frequent cases, they are caused by cracks in the pump body, defective seals, faulty assembly of the device or leaking cylinders.

Cracks in the pump casing

Cracks in the pump casing are one of the main causes of oil loss. These cracks are caused by many different factors, including excessive wear, impact or thermal stress.

If you use your equipment in high-temperature conditions, for example, it may be subjected to significant thermal stresses, causing cracks to appear in its body. Once these cracks appear, they can rapidly expand and cause significant oil loss.

That's why you need to monitor the condition of your equipment regularly, to detect any cracks as soon as possible.

Defective seals

Seals are essential parts that prevent oil from passing through the narrow openings that separate pump parts. They are designed to withstand high pressure and temperature conditions, as well as normal wear and tear.

However, over time they can deteriorate due to exposure to chemicals or other environmental factors. When damaged or defective, they may no longer perform their sealing function and cause oil leaks.

Faulty assembly of the device

Another factor that can cause oil leaks is faulty pump assembly.

If the parts of your hand-held device are not assembled correctly, the seals may not be properly aligned, leading to leaks.

Loose bolts, for example, can cause the pump to move and lead to oil loss.

Leaking cylinders

Did you know that leaking hydraulic cylinders can also cause oil leaks ?

These rod ends work by pushing a piston through a cylinder filled with hydraulic oil under pressure. Loose or broken bolts or other mechanical problems can cause rod ends to leak under high pressure. If the cylinder leaks, this means that hydraulic oil can escape, creating an oil leak.

How to solve oil leaks on a manual hydraulic pump ? ?

Pompe hydraulique manuelle en ligne simple effet 70 cm3, 230 bars

To detect and solve oil leaks on a manual hydraulic pump, it is important to follow a systematic approach that includes checking the oil level, locating the loss, its origin and replacing the faulty part if necessary.

Check oil level

If you want to know if your pump is leaking oil, you need to check the oil level in the reservoir using a dipstick.

Before starting the check, make sure your equipment is switched off. The dipstick is usually located near your hydraulic tool. Remove it and clean it with a clean cloth to remove any oil or dirt residue. Replace it in the reservoir and remove it again to check the oil level. The level should be between the "minimum" and "maximum" marks on the dipstick.

If the oil level is low, be sure to top it up until it reaches the "maximum" mark. Make sure you are using the recommended hydraulic fluid to avoid compatibility or performance problems.

Locating the leak

Once you've checked the oil level and refilled the reservoir if necessary, you should meticulously inspect all joints and connections to detect the source of the leak. Leaks can occur at various levels, including seals, hydraulic cylinders, valves, fittings, hoses, valves or any other component of the hydraulic system.

When inspecting, you should look for visible signs of leaks, such as oil stains or dirt build-up around joints or connections. You can also use a paper towel to detect leaks. Place the paper towel around the joints and connections and leave it in place for a few minutes. If the paper is wet, this indicates that there is a leak there.

Once you have located the leak, you can determine the cause of the loss and take the necessary steps to repair it.

Depending on the severity of the leak, you may decide to repair or replace the seals or other defective components.

Replace seals

Pompe hydraulique manuelle 1 vitesse simple effet type P | Devis

If you find that the castif the oil leakage is coming from the seal, replace it to stop the loss.

However, before replacing the seal, carefully clean the area around the seal to prevent particles from entering the hydraulic system and causing further damage.

Next, remove the faulty seal with a suitable tool and re-clean the surface around the seal with a clean cloth. Lubricate the new seal with hydraulic oil before installing it in the seal groove.

In addition, make sure all connections and seals are tight to prevent any further oil loss.

Replace the hydraulic cylinders

If the oil leakage is coming from the hydraulic cylinders, you will need to replace them to stop the loss.

Before replacing the linear actuators, it is important that you depressurise the hydraulic circuit by opening the drain valve and allowing the fluid to flow until the pressure is released. You can then remove the rod ends by unscrewing the fixing bolts.

Once the old cylinders have been removed, you can install the new linear actuators and secure them with the bolts.

Repairing oil leaks can be complex, especially if you don't have the right tools and materials. It's best to contact a qualified professional. They have the experience and expertise needed to diagnose and solve this kind of problem effectively.

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